Ariston NIMBUS PLUS S NET Manual page 67

Electrical connections between internal and external unit
Before any work on the system, shut off the power at the breaker. Electrical connections between internal and external units must be performed using
the three low voltage terminals: GND, A, B.
Connect «GND» on the terminal block of the internal unit with «GND» on the external terminal block.
Connect «A+» terminal block on the internal unit with «A» on the external terminal block.
Connect «B-» terminal block on the internal unit with «B» on the external terminal block.
NOTE
It is strongly recommended to verify the presence of a surge protection device (SPD) on main power line and of circuit breakers
connected to the external and internal unit's control box
* See table of electrical connections
WARNING
After carrying out the connections between the indoor and outdoor unit, put back both panels of the respective units.
Y=1ph 3G-2,5 mm² min
Y=3ph 5G-2,5 mm² min
MOD. BUS
ANODE
TA 1 TA 2 SE TNK BUF
GND A+ B-
+24V
1 ph 3 ph
T T
ON ON
OFF OFF
XXA XXA XXA
30mA 30mA
N N N N N N
X=1ph 3G-2,5 mm² min
X=3ph 5G-2,5 mm² min
BUS IN
B T AUX 1
*
XXA
Modéles 40-50-70 (1ph)
*Y=16A (40-50) - 20A (70)
*X=20A
Modéles 90 T-110 T (3ph)
*Y=12A par phase
*X=10A par phase
67 / GB